Calculating-machine.



A. F. P0025.

CALCULA'HNG MACFHNE. APPucATmN HLED MAY 2, ma

Patented June 4, 1918.

UNITED STATES PATENT OFFICE.

ARTHUR F. POOLE, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE WAHL COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE.

CALCULATING-MACHINE.

Application filed May 12, 1913. Serial No. 787,051.

To all whom it may concern.

Be it known that I, ARTHUR F. POOLE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new anduseful Improvements in Calculating-Machines, of which the following is a specification.

My invention is an improvement in typewritmg calculating machines, particularly those of the class described in the patent to John C. Wahl, No. 893,719, July 21, 1908, and has for its object the'prevention of undue Wear on the adding attachment by providing two sets of numeral keys for the typewriter on which the'calculating machine is mounted. One of these sets of keys is used to write numbers which are not intended to be calculated, as dates, for instance, and I shall hereafter call this set the non computing set. The other set is used for numbers to be entered into the calculating machine, and I shall hereafter call this set the computing set. An automatic lock is provided to prevent the use of the non-computing set during the time when the totalizer of the calculating machine is in the calculating zone.

A further object of my invention is the provision of two sets of keys, each set having distinctive type, in order that numbers printed on the sheet may be identified as either being entered or not entered into the calculating machine, incombination with an automatic lock-preventingthe use of the non-computing keys while the totalizer is in the calculating zone.

A further object of my invention is the provision of a manual release for the noncomputing keys, thus permitting the use of thesekeys while the totalizer is in the calculating zone.

These and other objects of my invention are described in the accompanying specification, in the drawings of which Figure 1 represents a right elevation of a calculating machine embodying my inven* tion' Fig. 2 represents a front elevation;

Fig. 3 is a view of the keyboard employed,

#0 showing the two sets of keys; and

Specification of Letters Patent.

Patented June 4, 1918.

Fig. 4 is an illustration of the two type bars used for the computing and non-computing keys.

As before stated, my invention is used on a calculating machine of the type described in the cited Wahl patent, in which there is provided an actuating mechanism having amaster wheel connected to a set of computing keys by intermediate mechanism, whereby the depression of any computing key rotates the master wheel a predetermined amount. A totalizer is suitably mounted to move in reference to the master wheel and is provided with the customary set of carrying wheels. Numbers are inserted in this totalizer one digit at a time by operating the computing keys, the totalizer escaping one step to the left after the insertion of each digit. Coincident with the insertion there'- of, each digit is printed by a type bar actuated by the operated computing key. Since the exact construction of a machine of this kind is thoroughly described in the Wahl patent above referred to, and is not neces' sary to the understanding of my present in vention, which relates to a particular method of operating the typewriter and actuator, I will not enter further into a description of the Wahl machine.

Coming now to the parts peculiar to my present invention, in Fig. 1 is shown an actuator 1 mounted on the framework 2 of the typewriter and connected by pull rods 3 to a set of computing keys 4. Each of the key: a is provided with the customary printing type-bar (not shown), so that numbers en-- tered into the calculating machine may be printed. Moving with the typewriter carriage is the totalizer adapted to engage with the master wheel 6 as said totalizer moves from right to left during the operation of the machine.

In addition to the set of computing keys 4 with their associated type bars, a set of non- I shall now describe the means for locking these non-computing keys while the totalizer is in the adding zone. l-ulcrumed at 9 0n the framework 2 1s a lever 10 having-at one end a roller 11 adapted to be'engaged and depressed by a cam 12 mounted on the totalizer 5, the cam and roller being so propor-f tioned that such engagement occurs while the totalizer is in the calculating zone. Fulcrumed on the framework 2 at 13 is a bell crank 14 having a horizontal and a depending arm. A spring 18 attached between the depending arm of the bell crank 1+ and the framework 2 gives the bell crank a tendency to rotate in a counter-clockwise direction. The lever 10 is cpnnected to the horizontal arm of the bell crank 14. by a pull rod 16. A stop 17 rigid with the lever 10 and contact ing with the framework 2 determines the normal position of the lever 10 and bell crank 14 as the position shown in Fig. 2.

A universal locking bar 19 is supported from the framework 2 by two short links 20 and 21 pivoted at 2'2 and The links 20 and 21 are equal and parallel, and therefore the bar 19 is free to swing parallel to itself about the pivots 22 and 23. A spring 2 1- between the framework 2 and the bar 19 tends to move the bar to the left (Fig. 3). This motion is prevented by a pin 30 mounted in the bar 19 and extending in the path of the depending arm of the bell crank H. The spring 18 being much stronger than the tpring 21 the normal position of the abovementioned parts will be that shown in Fig. 2. Rotation of the iever 10 due to the totalizer 5 moving into the calculating zone, and consequent engagement of the cam 12 with the roller 11, will therefore permit the looking bar 19 to be moved to the left by the force of the spring 24.

Each pull rod 15 is provided with a projection 25 rigid with it, and on the bar 19 are provided a set of pins 2t) adapted to engage the projections 25 when the bar 19 is swung to the left. It will be now obvious that when the bar 19 and the lever 10 are in their normal positions, as shown in Fig. 2, the non-computing kcys 7 will be free to operate, but that whe the roller 11 is engaged by the cam 12, thus shifting the locking bar 19 to the left, the non-computing keys '7 will be locked by reason of the pins 26 being in the path of the projections 25, and that .this look will continue as long as the roller 11 is in contact with the cam 12. The parts are so dimensioned that engagement of the roller 11 and cam 12 will continue as long as the totalizer 5 is in engagement with the master wheel 6; or, in other words, during the time the totalizer is in the adding zone. Therefore the set of non-computing weaves keys 7 will be locked during such a period, and any printing which is then done on the work sheet must be done by the computing cys 1, and these keys, as before mentioned, are the ones which enter numbers into the .totalizer.

In Fig. 4, 1 have shown examples of twostyles of type, 28 and 29. One of these styles, 29, is on the type bars for the non computing keys 7, and the other style, 28, is similarly associated with the computing keys 4. Use of the two styles is of advantage in identifying numbers on the work sheet as being written b the computing keys and entered in the cafbulating machine or being written by the non-computing keys and not so entered.

It. may sometimes happen that it is desired to print a non-computed number, such as a date. in the column in which are printed computed numbers. In the construct-Ion previously described this would be impossible, since the non-computing keys are then locked by the bar 19. I have therefore provided a handle 27 rigid with the link 20 for holding the bar 19 temporarily in its normal position, as shown in Fig. 2, independent of the position of the lever 10. l/Vith the bar 19 in its normal position, the non-computing keys are of course unlocked. On releasing the handle 27, the bar 19 will take the position determined by the position of the lever 10.

It is to be noticed that while the operator is freeto use the computing keys when the totalizer is not in the adding Zone, no harm will result from such use, since, while the numbers will be printed on the work sheet. they will not lie-entered into the totalizer owing to the totalizer not being in engagement with the. master wheel at that time. My invention therefore provides an effective safeguard against the operators using the wrong set of keys to enter a number in the t'otalizer.

Another advantage of providing two sets of keys. each set provided with a set of independent type bars is that the wear on the calculating machine is materially lessened, since the calculating-machine keys and actuator are used only when a calculation is made, thus materially lightening the touch of the typewriter for non-computed num bers; When but a single set of keys is used both for printing numbers to be computed and other numbers, the actuator is operated each time anumber is printed whether the number is computed or not. The touch of these keys is therefore harder than that of a sheet is in the calculating zone.

mining acalculating zone on a work sheet;

a set of computing keys adapted to print on said w k sheet; a set of non-computing keys so adapted to print on said work sheet; and means for locking the non-computing keysgwhile the work sheet is in the" calculating zone.

2. In a recording calculating machine, the combination of: a traveling member determining a calculating zone on a work sheet;

a set of computing keys adapted to print on said work sheet; a set of noircomputing keys also adapted to print on said work sheet; and means controlled by said traveling member for locking the non-computing keys while the work sheet is in the calculating zone.

3. In a recording calcutlating machine, the combination of: a decimal carriage, a cam traveling with said decimal carriage, a set of computing keys adapted to print on a work sheet a set of non-computing keys l also adapted to print on said work sheet, and means controlled by said 0 for looking the non-computing keys wh'le the work 4. In a recording calculating inachine, the combination of: a traveling in nber determining a calculating zone on a work sheet; a set of computing keys adapted to print on said work sheet; -a set of non-compllting keys also adapted to print on said work sheet; means for locking the non-computing keys while the work sheet is in the calculating zone; and manually operated. means 40 rendering said lock ineffective. u

In a recording calculatingmachine, the combination of: a traveling member determining a calculating zone on a work sheet;

a set of computing keys adapted to print on 5 said work sheet; a set of non computing keys also adapted to print on said work sheet; means tor locking the noii-com 'iuting keys while the work sheet is in the calculating zone; manually operated means render ing said lock ineffective; and a spring return for said manually operated means.

6. In a recording calculating machine, the combination of: a traveling member determining a calculating zone on a work sheet; a set of computing keys adapted to print on said work sheet with one style of type; a set of non-computing keys adapted to print on said work sheet ,with another style of type; and means for locking the non-computing keys while the work she; is

in t e calculating. zone. 1 7. In a recording calculating ;machine, the combination of a decimal carriage, a cam traveling with said decimal carriage, a

s5 set of (-mnpriting keys adapted to print on a work sheet with onetstyie of type, a set of non-computing keys adapted to print on said work sheet with another style of type,,

and means controlled by said c tot: looking the non-computing ,ikeys w do the work sheet is in the calculating zone.-

8. In a recording calculating r nachin'e, the combination of: a. traveling member determining a calculating zone on a work sheet; a set of computing ,keys adapted to print on said work sheet with one style of type; a set of non-computing keys adapted to print on si'id work sheet with' another style of type means for locking the nons computing keys while the work sheet is'iri the calculating zone; and manually operated means rendering said lock ineffective,

9. In a ty'iewriting calculating ,machine, the combine on, of: a traveling member determining ,-'a calculating zone on a work. 'eet; a h of computing keys; a set of type b rs co nected therewith and adapted to pri on said work sheet; a set of non-oomputing keys; a set of type bars connected therewith and adapted to print on said work sheet; and means for locking the non-computing keys while tlip work sheet is in the calculating zone.

10. In a typewriting calculating machine, the combination of: a traveling member determining a calculating zone on a work sheet a set of computing keys; a set of type bars connected therewith' and adapted to print on said work sheet with one style of type; a set of non-computing keys; a set of type bars connected therewith and adapted to print on said Work sheet with another style of type; and means for locking the non-computing keys while the work sheet is in the calculating" zone.

11. In a calculating machine, the oombination of a platen adapted to receive a worksheet, a traveling member determining a calculating-zone thereon, a totalizer adjustable on said traveling member, a set of computing keys adapted to print on said work sheet and enter numbers in said totalizer, a set of non-computing keys also adapted to print on said work sheet and means associated with said totalizcr for locking the1'non-computing keys while thel Worksheet is in the calculating zone. 12. In a calculat1ngmachine,th a dombination of a platen adapted to receivg a wo'rkculating zone thereon, a totalizer adplstable on aid traveling member, a 'set of computset ot-iioigcomputing keys also adopted to print on said worksheet, a cam mounted on said vtotalizer and means cooperating with said-"cam for locking the non-com uting ey wfiilerthe worksheet is in the ca culatin? zone. I

sheet, a traveling member determinm a 011-.

13. In a calculating machine, the cembination of a platen adapted to i'eceive'e worksheet, at, 'avehng member determining a calculating zone thereon, a toivalizer adjustable on said t aveling member, a set 0fc0mputing keys adapted to print on said WOIksheet and enter numbers in said totalizei', a set of men-computing keys else adapted he print on said work ,sheet, 11 mm on saici totaiizer, and a lever controlling a lock for in the non-computing keys and adapted to be acted on by said cam. In Witness whereof, I have hereunto signed my name, this 8th day OI" May, 1913.

ARTEHUR F. POOLE. i -fianesses DAVID D. GOLDBERG, EVA MEYER. 

